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False positive diagnosis in conventional and liquid-based cervical specimens
Sharon Mount1, Maureen Harmon, Gamal Eltabbakh
1Department of Pathology, University of Vermont, 111 Colchester Avenue, Burlington, Vermont 05401, USA. sharon.mount@vtmednet.org
Acta Cytologica
|June 15, 2004
Summary
False positive cervical cancer diagnoses were identified in both conventional and liquid-based smears. High-grade squamous intraepithelial lesions (HSIL) with keratinization or inflammation mimicked invasive cancer, leading to overdiagnosis.
Area of Science:
- Gynecologic Pathology
- Cervical Cytology
- Diagnostic Accuracy
Background:
- Cervical cancer screening relies on accurate cytologic interpretation.
- Distinguishing high-grade squamous intraepithelial lesions (HSIL) from invasive carcinoma is critical.
- Both conventional and liquid-based cytology methods are used for cervical smear analysis.
Observation:
- A retrospective review identified 7 false-positive cervical cancer diagnoses out of 68 cases with histologic follow-up.
- False positives occurred in both conventional (4/32) and liquid-based (3/36) cytology preparations.
- Histologic correlation revealed all 7 cases were HSIL without invasion.
Findings:
- Key features contributing to false positives included cellular pleomorphism, keratinization, nuclear pyknosis, necrosis, and atrophy.
- No significant difference in false positive rates was observed between conventional (12.5%) and liquid-based (8.3%) cytology.
- HSIL exfoliation mimicking invasive malignancy, especially with keratinization or in an atrophic background, was the primary cause of overdiagnosis.
Implications:
- Understanding factors leading to false positives can improve diagnostic accuracy in cervical cytology.
- Awareness of HSIL features that mimic invasion is crucial for cytopathologists.
- This study highlights the importance of cytologic-histologic correlation for refining diagnostic criteria and reducing false positive diagnoses in cervical screening.